[jen20]

> why Rust and Python put so much effort into adding event loops after the fact.

Perhaps Python, but Rust went the other way - it had all that stuff built and it was removed.

[traderj0e]

Er yeah technically the event loop isn't part of Rust, just the async/await syntax. But it's implied that you're going to use some event loop with it.

[tracker1]

No, it's implied that you're going to use some sort of async runtime with it... said runtime can be simple real threads, a thread pool or virtual threads and there are implementations for all of them. And even then, it's super easy to start a new real thread in rust, around any async runtime.

[jen20]

While true, this isn’t what I’m talking about: Rust had _built in_ green threads at one point, the same as Go [1].

[1]: https://rust-lang.github.io/rfcs/0230-remove-runtime.html

[jen20]

True now, but there was a time when async/await was _not_ part of Rust, and a runtime was.